JP2010072110A - Liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display panel which has high luminance and high contrast. <P>SOLUTION: The liquid crystal display panel includes an array substrate having signal lines 11 and scan lines 12, an opposite substrate, a liquid crystal layer, a color filter formed of colored layers of a plurality of colors, and a light shield portion provided to the opposite substrate and having a plurality of striped portions 21a overlapping boundaries between the signal lines and colored layers. Intervals between the signal lines 11 and intervals between the striped portions 21a are not equal. A plurality of pixel display areas R<SB>R</SB>, R<SB>G</SB>, and R<SB>B</SB>have mutually equal area. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal display panel.

  In general, a liquid crystal display panel has features such as light weight, thinness, and low power consumption, and thus is used in portable information terminals such as a mobile phone and a portable music player. In particular, a liquid crystal display panel can have high-speed response by including a thin film transistor as a switching element. For this reason, the liquid crystal display panel is used in a display unit of an electronic device such as a portable information terminal that displays a large amount of information.

  The liquid crystal display panel includes an array substrate, a counter substrate, and a liquid crystal layer. The array substrate has scanning lines and signal lines formed in a lattice shape. The counter substrate includes a light shielding portion that faces the signal line, and red, green, and blue colored layers that overlap the light shielding portion with a peripheral edge. A technique for providing a light shielding portion on the counter substrate is disclosed in, for example, Patent Document 1.

  In recent years, liquid crystal display panels used in portable information terminals are also demanded for high brightness and high contrast. However, in the liquid crystal display panel, since the signal line is made of metal, light leakage occurs along the signal line during black display. For this reason, when the pixel display area includes along the signal line, there is a problem that the liquid crystal display panel cannot obtain high contrast.

In order to solve the above problem, a technique has been proposed in which the width of the light shielding portion is increased and the light shielding portion covers the signal line. Thereby, a liquid crystal display panel having high contrast characteristics can be obtained.
JP 2002-350830 A

However, when the width of the light shielding part is increased and the light shielding part covers the signal line, the aperture ratio is greatly reduced, that is, the pixel display area is significantly reduced. Since the luminance level is lowered, a high-brightness liquid crystal display panel cannot be obtained. From the above, a liquid crystal display panel having high brightness and high contrast characteristics is desired.
The present invention has been made in view of the above points, and an object thereof is to provide a liquid crystal display panel having high luminance and high ton trust.

In order to solve the above-described problems, a liquid crystal display panel according to an aspect of the present invention includes:
An array substrate having a plurality of signal lines extending in a first direction and a plurality of scanning lines extending in a second direction orthogonal to the first direction;
A counter substrate disposed opposite to the array substrate with a gap;
A liquid crystal layer sandwiched between the array substrate and the counter substrate;
A color filter formed between a plurality of colored layers provided between the first substrate and the second substrate, each extending in the first direction and arranged alternately adjacent to each other in the second direction;
A light shield having a plurality of stripe portions provided on the counter substrate, each extending in the first direction and arranged at intervals in the second direction, and overlapping a boundary between the signal line and the coloring layer. And comprising
The interval between the signal lines and the interval between the stripe portions are unequal,
A plurality of pixel display regions surrounded by two adjacent scanning lines and two adjacent signal lines and stripe portions have the same area.

  According to the present invention, a liquid crystal display panel having high brightness and high ton trust can be provided.

Hereinafter, a liquid crystal display panel according to an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 4, the liquid crystal display panel is sandwiched between the array substrate 1, the counter substrate 2 disposed opposite to the array substrate with a predetermined gap, and the array substrate and the counter substrate. The liquid crystal layer 3, the color filter 4, the first polarizing plate 5, and the second polarizing plate 6 are provided. The liquid crystal display panel includes a rectangular display region R1.

  The array substrate 1 has a rectangular glass substrate 10 as a first substrate. The counter substrate 2 has a rectangular glass substrate 20 as a second substrate. The first substrate and the second substrate are not limited to glass substrates, but may be any transparent insulating substrate. In the display region R1, the liquid crystal display panel has a plurality of pixels P provided in a matrix between the glass substrate 10 and the glass substrate 20.

  In the array substrate 1, a plurality of signal lines 11 extending in the first direction d1 and arranged in the second direction d2 perpendicular to the first direction on the glass substrate 10 and intersecting the plurality of signal lines. A plurality of scanning lines 12 extending in the second direction and arranged at intervals in the first direction are arranged in a lattice pattern. Each pixel P is provided so as to overlap an area surrounded by two adjacent signal lines 11 and two adjacent scanning lines 12.

  For example, a plurality of TFTs (thin film transistors) 13 are provided as a plurality of switching elements near the intersection of the signal line 11 and the scanning line 12 on the glass substrate 10. The TFT 13 includes a gate electrode 13a extending a part of the scanning line 12, a gate insulating film 13b provided on the gate electrode, a channel layer 13c facing the gate electrode through the gate insulating film, and one region of the channel layer. And a drain electrode 13e connected to the other region of the channel layer.

  The source electrode 13d is connected to the signal line 11, and the drain electrode 13e is connected to a pixel electrode 15 described later. The TFT 13 is formed of a common gate insulating film 13b. One TFT 13 is provided for each pixel P, and constitutes a pixel.

  An interlayer insulating film 14 is formed on the glass substrate 10, the signal line 11, the scanning line 12, and the TFT 13. In the display region R1, a plurality of pixel electrodes 15 are provided in a matrix on the interlayer insulating film. The pixel electrode 15 is formed of a transparent conductive material such as ITO (indium tin oxide). Each pixel electrode 15 is electrically connected to the drain electrode 13e of the corresponding TFT 13 through a contact hole 14h formed in the interlayer insulating film 14. One pixel electrode 15 is provided for each pixel P, and constitutes a pixel.

  A plurality of columnar spacers 16 are formed on the pixel electrode 15 as a plurality of spacers. The spacer is not limited to the columnar spacer 16 and may be another spacer such as a spherical spacer. An alignment film 17 is formed on the interlayer insulating film 14 and the pixel electrode 15.

  In the counter substrate 2, a stripe-shaped first light shielding part 21 and a rectangular frame-shaped second light shielding part 22 are provided on a glass substrate 20. The first light shielding portion 21 is formed so as to overlap the signal line 11. The second light shielding portion 22 is formed surrounding the display region R1.

  A color filter 4 is disposed on the glass substrate 20. The color filter 4 has a red colored layer 4R, a green colored layer 4G, and a blue colored layer 4B.

  The colored layer 4R is formed in a stripe shape, extends in the first direction d1, and is arranged at intervals in the second direction d2. Each colored layer 4 </ b> R is disposed with its peripheral edge overlapping the first light shielding portion 21. The colored layer 4G is formed in a stripe shape, extends in the first direction d1, and is arranged at intervals in the second direction d2. Each colored layer 4 </ b> G is arranged with its peripheral edge overlapping the first light shielding portion 21. The colored layer 4B is formed in a stripe shape, extends in the first direction d1, and is arranged at intervals in the second direction d2. Each colored layer 4 </ b> B is disposed with its peripheral edge overlapping the first light shielding portion 21.

The colored layers 4R, 4G, and 4B are alternately arranged adjacent to each other in the second direction d2. The pixel P has any one of the colored layers 4R, 4G, and 4B.
On the color filter 4, a counter electrode 23 made of a transparent conductive material such as ITO is formed. An alignment film 25 is formed on the counter electrode 23 on the counter electrode 23.

The array substrate 1 and the counter substrate 2 are arranged to face each other with a predetermined gap by a columnar spacer 16. The array substrate 1 and the counter substrate 2 are joined to each other by a sealing material 31 disposed on the peripheral edge of both substrates. The liquid crystal layer 3 is sandwiched between the array substrate 1 and the counter substrate 2. A liquid crystal injection port 32 is formed in a part of the sealing material 31, and the liquid crystal injection port is sealed with a sealing material 33.
The first polarizing plate 5 is provided on the outer surface of the glass substrate 10. The second polarizing plate 6 is provided on the outer surface of the glass substrate 20. The outer surface of the second polarizing plate 6 is a display surface. A liquid crystal display panel is formed as described above.

Next, the liquid crystal display panel will be described in more detail. In particular, the signal line 11 and the first light shielding portion 21 will be described in detail.
As shown in FIGS. 1 to 4 and 5, the spacing between the signal lines 11 is unequal. The interval p1 _G between the signal lines 11 sandwiching the colored layer 4G (green pixel P _G ) is equal to the interval p1 _R between the signal lines 11 sandwiching the colored layer 4R (red pixel P _R ) and the colored layer 4B (blue). The distance between the signal lines 11 across the pixel P _B ) is larger than the interval p1 _B. The signal lines 11 have the same width w1.

In this embodiment, the interval p1 _G is 50 μm, and the interval p1 _R and the interval p1 _B are each 35 μm. The interval p2 between the scanning lines 12 is 120 μm, and the width w1 of the signal line 11 is 8 μm.

  As shown in FIGS. 1 to 4 and 6, the first light shielding portion 21 has a plurality of stripe portions 21 a. The stripe portions 21a extend in the first direction d1 and are arranged at intervals in the second direction d2. The stripe part 21 a overlaps the signal line 11. Furthermore, the stripe part 21a also overlaps the boundary between the colored layers 4R, 4G, and 4B.

The spacing between the stripe portions 21a is unequal. The spacing p3 _G between the stripe portions 21a sandwiching the colored layer 4G (green pixel P _G ) is equal to the spacing p3 _R between the stripe portions 21a sandwiching the colored layer 4R (red pixel P _R ) and the colored layer 4B (blue color). Is smaller than the interval p3 _B between the stripe portions 21a across the pixel P _B ). The width of the stripe portion 21a is different. The width w2a of the stripe portion 21a sandwiching the colored layer 4G (green pixel P _G ) is larger than the width w2b of the other stripe portion 21a.

In this embodiment, the interval p3 _G is 42 μm, and the interval p3 _R and the interval p3 _B are each 38 μm. The width w2a is 10 μm and the width w2b is 5 μm.

  As shown in FIGS. 1 to 7, the area of the stripe portion 21a located away from the signal line 11 differs for each color of the colored layers 4R, 4G, and 4B on which the stripe portion 21a overlaps. Here, the area of the stripe portion 21a that is separated from the signal line 11 and overlaps the colored layer 4G is the largest. Further, the stripe portion 21 a is not located outside the signal line 11 in the region overlapping the colored layers 4R and 4B.

Pixel _{P R, P G, P B} is adjacent two scanning lines 12, arranged pixel display region surrounded by the two signal lines 11 and the stripe portion 21a adjacent to the sequence _{R R,} R G, the _{R B} It has been. The widths w4 _R , w4 _G , and w4 _B of the pixels P _R , P _G , and P _B are equal to each other.
In this embodiment, the widths w4 _R , w4 _G , and w4 _B are each 20 μm. For this reason, the pixel display regions R _R , R _G , and R _B (transmission display regions) have the same area.

According to the liquid crystal display panel configured as described above, the interval between the signal lines 11 and the interval between the stripe portions 21a are unequal. The stripe portion 21a that overlaps the colored layer 4G (green pixel P _G ) is located away from the signal line 11. Therefore, it is possible to prevent light leakage from the vicinity of the signal line 11 of the most adversely affects the pixel P _G to display the image in the black. Thereby, the liquid crystal display panel can obtain high contrast.

The stripe portion 21a that overlaps the colored layer 4G (green pixel P _G ) not only is positioned away from the signal line 11, but also overlaps the signal line 11, at least the side edge of the signal line 11. For this reason, even if a positional shift occurs in the process of bonding the array substrate 1 and the counter substrate 2, the stripe portion 21a can prevent light leakage.

Further, the area where the stripe portion 21a is located away from the signal line 11 in the region overlapping the colored layer 4G is about 1/3 of the pixel display region _RG . In the region overlapping with the colored layers 4R and 4B, the stripe portion 21a is not positioned away from the signal line 11. R _R, R G by the stripe portion _21a, the reduction of the area of the R _B because it has minimal, it is possible to minimize the reduction in the aperture ratio. Thereby, the liquid crystal display panel can obtain high luminance.

Then, the distance between the signal line 11, by which to adjust the spacing between the stripe portion 21a, can be made equal to each other and the area of the pixel display region _{R R, R G, R B} . Thereby, a liquid crystal display panel excellent in display quality can be obtained.
As described above, a liquid crystal display panel having high luminance and high ton trust can be obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. For example, some components may be deleted from all the components shown in the embodiment.

  For example, the color filter 4 is not limited to the counter substrate 2 side, and may be provided on the array substrate 1 side.

The first light shielding portion 21 is not limited to a stripe shape, and may be formed in a lattice shape. The first light shielding portion 21 is formed so as to overlap the signal line 11 and the scanning line 12. The first light shielding unit 21 may prevent light leakage from the vicinity of the signal line 11 and light leakage from the vicinity of the scanning line 12.

1 is a perspective view of a liquid crystal display panel according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a part of the liquid crystal display panel shown in FIG. 1. FIG. 3 is a schematic configuration diagram showing a part of the array substrate shown in FIGS. 1 and 2. The top view which shows roughly the wiring structure of the said array board | substrate. It is the top view which looked at the signal line and scanning line of the said array substrate from the display surface side, and is a figure which shows the space | interval between signal lines especially. It is the top view which looked at the stripe part and colored layer of the opposing board | substrate of the said liquid crystal display panel from the display surface side, and is especially a figure which shows the space | interval between stripe parts and the width | variety of a stripe part. 2 is a plan view of a signal line, a scanning line, a stripe portion, and a pixel display area of the liquid crystal display panel as viewed from the display surface side, and particularly shows the area of the pixel display area and the pixel width. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Array substrate, 2 ... Opposite substrate, 3 ... Liquid crystal layer, 4 ... Color filter, 4R, 4G, 4B ... Colored layer, 10 ... Glass substrate, 11 ... Signal line, 12 ... Scanning line, 13 ... TFT, 15 ... pixel electrode, 20 ... glass substrate, 21 ... first shielding portion, 21a ... stripe portion, 22 ... second shielding portion, 23 ... counter electrode, R1 ... display _{area, R R, R G, R} B ... pixel display area, _{P, P R, P G,} P B ... _{pixels, p1 R, p1 G, p1} B, p2, p3 R, p3 G, p3 B ... _{interval, w1, w2a, w2b, w3} , w4 R, w4 G, w4 _B : width, d1: first direction, d2: second direction.

Claims (3)

An array substrate having a plurality of signal lines extending in a first direction and a plurality of scanning lines extending in a second direction orthogonal to the first direction;
A counter substrate disposed opposite to the array substrate with a gap;
A liquid crystal layer sandwiched between the array substrate and the counter substrate;
A color filter formed between a plurality of colored layers provided between the first substrate and the second substrate, each extending in the first direction and arranged alternately adjacent to each other in the second direction;
A light shield having a plurality of stripe portions provided on the counter substrate, each extending in the first direction and arranged at intervals in the second direction, and overlapping a boundary between the signal line and the coloring layer. And comprising
The spacing between the signal lines and the spacing between the stripe portions are unequal,
A liquid crystal display panel in which a plurality of pixel display regions surrounded by two adjacent scanning lines and two adjacent signal lines and stripe portions have the same area.   2. The liquid crystal display panel according to claim 1, wherein an area of the stripe portion located away from the signal line is different for each color of the colored layer on which the stripe portion overlaps. The color filter is formed of a plurality of colored layers of red, green and blue,
An interval between the signal lines sandwiching the green colored layer is wider than an interval between the signal lines sandwiching the red colored layer and an interval between the signal lines sandwiching the blue colored layer,
2. The interval between the stripe portions sandwiching the green colored layer is narrower than the interval between the stripe portions sandwiching the red colored layer and the interval between the stripe portions sandwiching the blue colored layer. Or the liquid crystal display panel of 2.

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